When: 2011-01-03

Collection location: Shorecrest High School, Shoreline, King Co., Washington, USA [Click for map]

Who: Tim Sage (NMNR)

No specimen available

Growing on the same large ornamental stones as many of my lichen observations from Shorecrest High School.

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By: Jason Hollinger (jason)
2011-01-04 16:23:29 CST (-0600)

I’d say this is definitely Diploschistes — typica habit: agressive growth, large sunken apothecia, grayish color, on rock and moss.

D. scruposus is supposed to be on granitic rock, and D. muscorum on lichens (esp. Cladonia) and moss. Yes, yours has overflowed the rock onto adjacent mosses, but it clearly started on rock and isn’t doing so well on the neighboring moss, so I’d say it is D. scruposus.

According to Ozarks keys (Harris & Ladd 2004), they both have lecanoric acid (strong C+r reaction), but:

D. scruposus: Thallus saxicolous, with subtle yellowish gray tinge; spores 4-8 per ascus
D. muscorum: Thallus lichenicolous, muscicolous or lignicolous, pale mineral gray; spores 4 per ascus


Created: 2011-01-03 22:18:31 CST (-0600)
Last modified: 2011-01-04 16:24:02 CST (-0600)
Viewed: 40 times, last viewed: 2019-05-16 01:00:51 CDT (-0500)
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